[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.397365] audit: type=1800 audit(1546837285.644:25): pid=7846 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.434016] audit: type=1800 audit(1546837285.644:26): pid=7846 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.459617] audit: type=1800 audit(1546837285.644:27): pid=7846 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.66' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 58.297494] ------------[ cut here ]------------ [ 58.302513] kernel BUG at net/core/skbuff.c:1459! [ 58.307716] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 58.313070] CPU: 0 PID: 7999 Comm: syz-executor784 Not tainted 4.20.0+ #13 [ 58.320061] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.329404] RIP: 0010:pskb_expand_head+0xbb0/0x1080 [ 58.334399] Code: 8b b5 e0 fe ff ff 48 85 f6 0f 84 4d fe ff ff e8 a6 ca 68 fb 4d 8d 74 24 ff e9 3e fe ff ff e8 97 ca 68 fb 0f 0b e8 90 ca 68 fb <0f> 0b e8 89 ca 68 fb 81 8d 10 ff ff ff 00 20 00 00 e9 0f f6 ff ff [ 58.353325] RSP: 0018:ffff8880855b75e0 EFLAGS: 00010293 [ 58.358667] RAX: ffff88808dc60640 RBX: ffff88809d985200 RCX: ffffffff86192268 [ 58.365917] RDX: 0000000000000000 RSI: ffffffff86192ca0 RDI: 0000000000000005 [ 58.373165] RBP: ffff8880855b7720 R08: ffff88808dc60640 R09: ffffed1013b30a5b [ 58.380445] R10: ffffed1013b30a5a R11: ffff88809d9852d7 R12: ffff88809d9852bc [ 58.387706] R13: 000000000000003f R14: dffffc0000000000 R15: 0000000000000000 [ 58.394956] FS: 00007fe0fe145700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 58.403162] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 58.409023] CR2: 0000000020000300 CR3: 00000000957f1000 CR4: 00000000001406f0 [ 58.416396] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 58.423652] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 58.430901] Call Trace: [ 58.433476] ? lock_acquire+0x1db/0x570 [ 58.437433] ? lock_downgrade+0x910/0x910 [ 58.441565] ? skb_release_data+0x970/0x970 [ 58.445873] ? lockdep_hardirqs_on+0x415/0x5d0 [ 58.450441] __pskb_pull_tail+0x13a/0x1740 [ 58.454719] ? _copy_to_iter+0x3a1/0x1400 [ 58.458861] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 58.464066] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 58.469585] ? __skb_try_recv_datagram+0x448/0x5b0 [ 58.474495] ? pskb_carve+0x1e20/0x1e20 [ 58.478449] ? __check_object_size+0xa3/0x77a [ 58.483039] ? iov_iter_copy_from_user_atomic+0xff0/0xff0 [ 58.488560] ? usercopy_warn+0x110/0x110 [ 58.492602] ? ___might_sleep+0x1e7/0x310 [ 58.496730] ? arch_local_save_flags+0x50/0x50 [ 58.501293] ? __fget+0x472/0x710 [ 58.504730] ip6_datagram_recv_specific_ctl+0x1751/0x1bd0 [ 58.510258] ? ip6_datagram_recv_common_ctl+0x5e0/0x5e0 [ 58.515611] ? skb_kill_datagram+0x130/0x130 [ 58.520025] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 58.525546] ? ip6_datagram_recv_common_ctl+0x37b/0x5e0 [ 58.530888] ? skb_copy_datagram_iter+0x10d/0x490 [ 58.535718] ? ipv6_recv_rxpmtu+0x920/0x920 [ 58.540045] ? skb_copy_and_hash_datagram_iter+0x50/0x50 [ 58.545487] ip6_datagram_recv_ctl+0x34/0x40 [ 58.549880] rawv6_recvmsg+0xc43/0xe90 [ 58.553800] ? aa_sk_perm+0x234/0x8e0 [ 58.557602] ? rawv6_rcv_skb+0x470/0x470 [ 58.561645] ? __fget_light+0x2db/0x420 [ 58.565618] sock_common_recvmsg+0x13f/0x2b0 [ 58.570121] ? compat_sock_common_getsockopt+0x150/0x150 [ 58.575572] ? apparmor_socket_recvmsg+0x2a/0x30 [ 58.580374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 58.585890] ? security_socket_recvmsg+0x9b/0xd0 [ 58.590626] ? compat_sock_common_getsockopt+0x150/0x150 [ 58.596060] sock_recvmsg+0xd0/0x110 [ 58.599755] __sys_recvfrom+0x30b/0x5d0 [ 58.603710] ? __ia32_sys_send+0x100/0x100 [ 58.607929] ? __sys_sendmsg+0x1a3/0x270 [ 58.611977] ? do_syscall_64+0x8c/0x800 [ 58.616054] ? do_syscall_64+0x8c/0x800 [ 58.620011] ? lockdep_hardirqs_on+0x415/0x5d0 [ 58.624574] ? trace_hardirqs_on+0xbd/0x310 [ 58.628877] ? do_futex+0x2910/0x2910 [ 58.632674] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.638050] ? trace_hardirqs_off_caller+0x300/0x300 [ 58.643137] __x64_sys_recvfrom+0xe1/0x1a0 [ 58.647353] do_syscall_64+0x1a3/0x800 [ 58.651222] ? syscall_return_slowpath+0x5f0/0x5f0 [ 58.656148] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 58.661143] ? __switch_to_asm+0x34/0x70 [ 58.665200] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 58.670024] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.675194] RIP: 0033:0x445809 [ 58.678368] Code: e8 6c b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 58.697276] RSP: 002b:00007fe0fe144da8 EFLAGS: 00000216 ORIG_RAX: 000000000000002d [ 58.704960] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445809 [ 58.712210] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 58.719543] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 58.726817] R10: 0000000000000002 R11: 0000000000000216 R12: 00000000006dac3c [ 58.734081] R13: 00007fffd5c4958f R14: 00007fe0fe1459c0 R15: 00000000006dad2c [ 58.741333] Modules linked in: [ 58.745243] ---[ end trace 254161eb7e62424e ]--- [ 58.750012] RIP: 0010:pskb_expand_head+0xbb0/0x1080 [ 58.755010] Code: 8b b5 e0 fe ff ff 48 85 f6 0f 84 4d fe ff ff e8 a6 ca 68 fb 4d 8d 74 24 ff e9 3e fe ff ff e8 97 ca 68 fb 0f 0b e8 90 ca 68 fb <0f> 0b e8 89 ca 68 fb 81 8d 10 ff ff ff 00 20 00 00 e9 0f f6 ff ff [ 58.774093] RSP: 0018:ffff8880855b75e0 EFLAGS: 00010293 [ 58.779473] RAX: ffff88808dc60640 RBX: ffff88809d985200 RCX: ffffffff86192268 [ 58.786760] RDX: 0000000000000000 RSI: ffffffff86192ca0 RDI: 0000000000000005 [ 58.794027] RBP: ffff8880855b7720 R08: ffff88808dc60640 R09: ffffed1013b30a5b [ 58.801340] R10: ffffed1013b30a5a R11: ffff88809d9852d7 R12: ffff88809d9852bc [ 58.808647] R13: 000000000000003f R14: dffffc0000000000 R15: 0000000000000000 [ 58.815948] FS: 00007fe0fe145700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 58.824176] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 58.830073] CR2: 0000000020000300 CR3: 00000000957f1000 CR4: 00000000001406f0 [ 58.837364] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 58.844615] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 58.851899] Kernel panic - not syncing: Fatal exception [ 58.858194] Kernel Offset: disabled [ 58.861822] Rebooting in 86400 seconds..